<template>
  <PageWrapper title="滚动组件函数示例" content="基于el-scrollbar">
    <div class="my-4">
      <a-button @click="scrollTo(100)" class="mr-2"> 滚动到100px位置 </a-button>
      <a-button @click="scrollTo(800)" class="mr-2"> 滚动到800px位置 </a-button>
      <a-button @click="scrollTo(0)" class="mr-2"> 滚动到顶部 </a-button>
      <a-button @click="scrollBottom()" class="mr-2"> 滚动到底部 </a-button>
    </div>
    <div class="scroll-wrap">
      <ScrollContainer class="mt-4" ref="scrollRef">
        <ul class="p-3">
          <template v-for="index in 100" :key="index">
            <li class="p-2" :style="{ border: '1px solid #eee' }">
              {{ index }}
            </li>
          </template>
        </ul>
      </ScrollContainer>
    </div>
  </PageWrapper>
</template>
<script lang="ts" setup>
  import { ref, unref } from 'vue';
  import { ScrollContainer, ScrollActionType } from '@/components/Container';
  import { PageWrapper } from '@/components/Page';
  import { type Nullable } from '@vben/types';

  const scrollRef = ref<Nullable<ScrollActionType>>(null);
  const getScroll = () => {
    const scroll = unref(scrollRef);
    if (!scroll) {
      throw new Error('scroll is Null');
    }
    return scroll;
  };

  function scrollTo(top: number) {
    getScroll().scrollTo(top);
  }
  function scrollBottom() {
    getScroll().scrollBottom();
  }
</script>
<style lang="less" scoped>
  .scroll-wrap {
    width: 50%;
    height: 300px;
    background-color: @component-background;
  }
</style>
